bloodlust breaks the game. Any other spell is just weaker in comparison. Humans straight up cannot fight bloodlust. Another orc has no other thing that other bloodlust spam to fight against it.
About 2 and 3, there's an actual solution.
I'm a little war2 modder and I have talked to some community members but I tend to find that people are way too conservative to ever make a change for the better in game.
Archers/Rangers/Trolls/Berserkers are not necessarily bad, but bloodlust/death&decay/Blizzard are way too strong. The natural counter to these units may be fireball/death coils or Flame shield. But again, the first 3 mentioned spells are way too overpowered.
in 3) I have a little re-balance game within one of my most recent war2 public free mods, called as Road of Heroes
All my mods in:
https://gamebanana.com/members/submissions/mods/1738346Road of Heroes in:
https://gamebanana.com/mods/433454Basically, here I have managed to apply some re-balance changes to units like Rangers which get an attack speed boost with Rangers upgrade, same as berserkers but not as fast as Rangers. Healing is also 4mana/1HP instead of 6mana/1HP to be more balanced against bloodlust and actually reward your APM for healing or Rangers micro usage. Archers + trolls also have a little boost to their base game attack speed.
Other stuff have been added up already like boosted skeletons on their skills, which makes Exorcism automatically more useful.
Gryphon Raiders + Dragons have faster attack speed.
Other planned stuff is to allow ground attack damage to apply into Gryphons or ground armor upgrades to Dragons. But also reducing range of D&D/Blizzard nor mana cost.
Still, if you're interested on more of this, you can check out my mod. Almost all the mods though are intended for Single player campaigns or custom maps.
I have came to play on other real time strategy games and overall, people are way too stubborn / conservative to ever apply a re-balance game patch for the better in any game... And I dont mean about waiting of like 2 months from testings to add like +2 damage to Grunts but actual re-balance patches that can attempt to change several other features of game to deliver whole new set of strategies.
Either way, if it's about to re-balance changes, I think the best method is this one used in League of legends where developers tend to release a new re-balance patch each 2-3 weeks to several of their in-game champions. This translated to War2, would be like applying a patch one time a month that may change about 5% of the game balance.
Fair enough to mention that, even if it's not likeable to be applied on main servers, there may still be worth to have a secondary server to allow testing up those new incoming re-balance patches... But again, this is up to community which overall seems way too conservative about it.
Hopefully this helps you out.